You may have stated this already, but I missed it as I read this thread...do you store any of you hobby data on the device you use in your "real life"? I've never had the two sides mix, and I have not signed up for LI (yet) because I'm paranoid about just such a scenario as you're describing. I'm following this thread with great interest, however, as I have been contemplating establishing a real world LI account.
I save no hobby information on any of my computers, phones, etc. I don't access any hobby account with apps that I use for RW purposes. I use web interfaces and private settings for all hobby activities. That seems to have worked for me over the years, but am always concerned I may be missing something.